can't install pyside

[dyln]

caners-MacBook-Pro:~ canereren$ pqcom Traceback (most recent call last): File "/usr/local/bin/pqcom", line 7, in from pqcom.pqcom import main File "/usr/local/lib/python2.7/site-packages/pqcom/pqcom.py", line 43, in from pqcom_ui import * File "/usr/local/lib/python2.7/site-packages/pqcom/pqcom_ui.py", line 10, in from PySide import QtCore, QtGui ImportError: No module named PySide caners-MacBook-Pro:~ canereren$